Question: Tell me binary operation whose name has the word union in it.
Paraphrase: Let me know twofold operation whose title has the word union in it.
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q164307 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'union')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: union, union